Concept study of sustainable noise control solution for HVAC systems based on microperforated elements

Lavrentjev, Jüri; Rämmal, Hans; Villau, Margus

doi:10.3176/proc.2021.4.13

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…These panels, characterized by numerous tiny perforations, offer enhanced acoustic performance while maintaining compactness and light weight characteristics. Research conducted at Tallinn University of Technology (TalTech) has extensively inves ti gated the application of microperforated panels in ICE exhaust silencers [7][8][9]. Studies have not only focused on their acoustic properties but also delved into issues such as endurance, reliability, and potential clogging phenom ena in realworld operating conditions [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Experimental acoustic characterization and optimization of various configurations are central to this endeavour. The selected MP panels, sourced from Sontech International AB under the Acustimet® brand [12], have undergone prior scrutiny by the authors, including assess ments in multilayered configurations to explore their full potential [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Experimental concept study of a small engine silencer unit based on microperforated elements

Villau,

Rämmal,

Lavrentjev

2024

PEAS

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Considering the green transformation, more and more attention must be paid to reducing noise pollution, which is one of the most important environmental problems today. Internal combustion engine (ICE) powered hand tools and small appliances, such as leaf blowers, brush cutters, chainsaws, and lawn mowers, are examples of the most undesirable sources of noise in today's human environment. This paper discusses the acoustic properties of a novel and compact silencer for a small twostroke ICE and proposes a novel concept with corresponding acoustic properties. The proposed solution has been measured on a test bench, and its properties, including transmission loss (TL) and reflection and absorption properties, have been experimentally determined. Using 3D printing technology and technological advantages, an innovative silencer with up to two microperforated (MP) panels, integrated into the expansion chamber of the original silencer, has been applied for rapid prototyping. As a result, noise reduction has been increased by at least 20 dB in the frequency range 800-4000 Hz.

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